单项选择题
A.1.6~2.0cm/kV B.2.0~2.5cm/kV C.2.5~3.2cm/kV D.3.2~3.8cm/kV
A.1000,250 B.500,1000 C.250,1000 D.1000,500
A.5°,100mm B.10°,100mm C.5°,200mm D.10°,200mm